Fitness calculators
14 calculators
Fitness calculators estimate BMI, BMR, calories, and related body metrics from the equations printed on each page. They are screening and planning aids, not a medical assessment.
Results depend on the formula named in How it works (for example Mifflin–St Jeor for BMR). Compare BMI with BMR or calorie targets when you need context, and treat outputs as approximate. Fitness pages need no login and no email.
Body metrics calculators
BMI, body fat, lean mass, and related size estimates.
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BMI Calculator
Body mass index from weight and height (Metric or US units).
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Body Fat Calculator
Estimate body-fat percentage with the U.S. Navy method.
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Ideal Weight Calculator
Ideal body weight estimate using the Devine formula.
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Lean Body Mass Calculator
Lean body mass estimate using the Boer formula.
Calories and metabolism calculators
BMR, TDEE-style maintenance, and calorie targets.
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BMR Calculator
Basal metabolic rate via the Mifflin–St Jeor equation.
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Calorie Calculator
Daily calorie target from BMR, activity, and goal.
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Calories Burned Calculator
Estimate calories burned from MET, weight, and duration.
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Macro Split Calculator
Grams of protein, carbs, and fat from calorie share percents.
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Maintenance Calorie Calculator
Daily maintenance calories (TDEE) from BMR and activity.
Training calculators
Pace, heart-rate zones, one-rep max, and protein targets.
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Heart Rate Zones Calculator
Rough training zones from max HR or 220−age.
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One Rep Max Calculator
Estimated 1RM using the Epley formula.
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Pace Calculator
Running/walking pace per unit distance from time and distance.
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Pace to Race Time Calculator
Finish time from pace and distance.
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Protein Target Calculator
Daily protein grams from body weight and g/kg factor.